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10.1074/jbc.RA118.001925

http://scihub22266oqcxt.onion/10.1074/jbc.RA118.001925
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29866880!6065181!29866880
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suck abstract from ncbi


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pmid29866880      J+Biol+Chem 2018 ; 293 (29): 11491-11504
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  • The kinase activity of the channel-kinase protein TRPM7 regulates stability and localization of the TRPM7 channel in polarized epithelial cells #MMPMID29866880
  • Cai N; Lou L; Al-Saadi N; Tetteh S; Runnels LW
  • J Biol Chem 2018[Jul]; 293 (29): 11491-11504 PMID29866880show ga
  • The channel-kinase transient receptor potential melastatin 7 (TRPM7) is a bifunctional protein with ion channel and kinase domains. The kinase activity of TRPM7 has been linked to the regulation of a broad range of cellular activities, but little is understood as to how the channel itself is regulated by its own kinase activity. Here, using several mammalian cell lines expressing WT TRPM7 or kinase-inactive variants, we discovered that compared with the cells expressing WT TRPM7, cells in which TRPM7's kinase activity was inactivated had faster degradation, elevated ubiquitination, and increased intracellular retention of the channel. Mutational analysis of TRPM7 autophosphorylation sites further revealed a role for Ser-1360 of TRPM7 as a key residue mediating both TRPM7 stability and intracellular trafficking. Additional trafficking roles were uncovered for Ser-1403 and Ser-1567, whose phosphorylation by TRPM7's kinase activity mediated the interaction of the channel with the signaling protein 14-3-3theta. In summary, our results point to a critical role for TRPM7's kinase activity in regulating proteasome-mediated turnover of the TRPM7 channel and controlling its cellular localization in polarized epithelial cells. Overall, these findings improve our understanding of the significance of TRPM7's kinase activity for functional regulation of its channel activity.
  • |14-3-3 Proteins/metabolism[MESH]
  • |Animals[MESH]
  • |Cell Polarity[MESH]
  • |Epithelial Cells/cytology/*metabolism[MESH]
  • |HEK293 Cells[MESH]
  • |Humans[MESH]
  • |Mice[MESH]
  • |Phosphorylation[MESH]
  • |Protein Binding[MESH]
  • |Protein Kinases/analysis/metabolism[MESH]
  • |Protein Stability[MESH]
  • |Protein Transport[MESH]


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